fix test

tests/test_circuit.py

@@ -44,7 +44,7 @@ def test_lines():
     assert c.lines[0].index == 0
     assert c.lines[1].index == 1
 
-    assert n1.outs[2] is None
+    assert len(n1.outs) == 2
     assert n2.ins[1] is None
     assert n2.ins[2] == line2